West Goshen Police Chief Joseph Gleason speaks to the media during a news conference outside police headquarters, Friday, June 30, 2017, in West Goshen, Pa. A man driving down a Pennsylvania highway shot recent high school graduate Bianca Roberson, 18, in the head, killing her, as the two tried to merge into a single lane, authorities said. (AP Photo/Matt Slocum)

Chester County District Attorney Tom Hogan said Desper surrendered around 2 a.m. Sunday. Desper's truck was recovered by police, along with the gun that detectives believe Desper used to shoot Roberson in the head.

Bianca Roberson was preparing for college. She was shot in the head by an unidentified white man over a lane change. https://t.co/t37FbnGoGU

Roberson was killed Wednesday on Route 100 in West Goshen Township, Pennsylvania. Roberson and the driver of a red pickup truck were trying to merge into the same lane before the incident turned deadly.

"They were jostling for a position or whatever. And unfortunately this gentleman took it to a degree that was just unconscionable," said West Goshen Police Chief Joe Gleason.